Mine leaks through the windshield rubber, it comes in under the rubber on the inside. I can't figure out it gets in over the windshield frame. I was told by a guy at the glass shop that the windshields are usually cut using the old one as a pattern and are cut to small, doesn't make sense to me either. But I have went out and srt in while it rains and it comes in in about the center and on the ends, I have been covering it with a plastic tarp

Check the vent screw holes. On my CJ5, they go right into the cab.. leaking water if the screws don't seal.

This might be a winner! Rain and thunderstorms were forecast for last night, so I decided to try and isolate this potential source.

Using blue masking tape, I carefully sealed around the edges of the vent grill where it meets the hood, and made sure the screw holes were also sealed.

We had a pretty good rain last night and this morning the floorboards on both sides were completely dry. It's supposed to rain some more today, so I'm going to leave the tape in place for awhile longer. I'm going to go ahead and make a gasket to seal things, and I may go so far as to find something to seal over the screws, too. Hard to believe so much water was getting in just through those little holes - that have screws in them - but I guess a stead drip adds up over several hours of the kind of heavy rain we get in the Delta.

I hope this does the trick. Sure would be nice to finally have a dry, non-musty cab.

__________________
"We are all of us in the gutter...
Some of us are looking at the stars."
~ Oscar Wilde via Chrissie Hynde

Mine leaks through the windshield rubber, it comes in under the rubber on the inside. I can't figure out it gets in over the windshield frame. I was told by a guy at the glass shop that the windshields are usually cut using the old one as a pattern and are cut to small, doesn't make sense to me either. But I have went out and srt in while it rains and it comes in in about the center and on the ends, I have been covering it with a plastic tarp

Go to Harbor Freight and get a set of their plastic windshield tools. Run one of the tools along the undersides of the windshield gasket and lay a bead of clear silicon along there. That will seal it.

__________________
"We are all of us in the gutter...
Some of us are looking at the stars."
~ Oscar Wilde via Chrissie Hynde

It is pouring down rain as we speak. I was out driving in it, and I got a little water in the right side but I think that came in under the door when I hit a really deep stretch of water at about 45 mph.
It had already been pouring hard for about 30 minutes at that point and everything was still dry.
If there isn't a big puddle in the floor after this storm passes, I'd be pretty confident in saying that was the culprit.
I'll report back when the skies clear.

__________________
"We are all of us in the gutter...
Some of us are looking at the stars."
~ Oscar Wilde via Chrissie Hynde

It rained cats and dogs for the rest of the afternoon and into the evening after my last post yesterday.
Until now, a rain like that would have resulted in about a half-inch of water pooling in my floor mats.

This morning I opened the door and... nothing. Not even damp.
So, I made a gasket this afternoon based on the illustration above, and installed it.
We'll see what happens, but I think we can call this one tentatively solved.

You wouldn't think that so much water could come in through those little screw holes, but there are six screws holding the vent grate on, and then another four or so underneath the grate that hold the vent box to the underside of the cowling. If each one of those screws leaks a drop every minute or two, then multiply that by ten or so and after awhile you have a puddle.

So, BESRK, if this pans out I owe you a chicken dinner next time you find yourself in Memphis. Or maybe some good Memphis BBQ.

__________________
"We are all of us in the gutter...
Some of us are looking at the stars."
~ Oscar Wilde via Chrissie Hynde

This might be a winner! Rain and thunderstorms were forecast for last night, so I decided to try and isolate this potential source.

Using blue masking tape, I carefully sealed around the edges of the vent grill where it meets the hood, and made sure the screw holes were also sealed.

We had a pretty good rain last night and this morning the floorboards on both sides were completely dry. It's supposed to rain some more today, so I'm going to leave the tape in place for awhile longer. I'm going to go ahead and make a gasket to seal things, and I may go so far as to find something to seal over the screws, too. Hard to believe so much water was getting in just through those little holes - that have screws in them - but I guess a stead drip adds up over several hours of the kind of heavy rain we get in the Delta.

I hope this does the trick. Sure would be nice to finally have a dry, non-musty cab.

Not sure if the 83 design is different than my 78, but the screw holes for the intake grill are inside of the fresh air box. Its design promotes draining of rainwater to one end and out the designated drain. However, there are small bosses on the underside of the cowl where each screw goes through. These bosses seem to go to the outside of the vent box. I could see that as a slight possibility for a water leak.

Therefore, I decided to try and seal mine. However, I took a different tact. Since the problem is at the screw holes, I put some silicone at each screw hole as well as on the 4 that hold the vent box up to the cowl. I also dabbed some silicone into the screw holes in the vent grill and buttoned it all up. I'll let you guys know how it works out at next rain event.

3M Strip Calk #08578 will be your best bet in stopping leaks around the air duct plenums. I used that stuff on the duct work, between fenders and firewall and to seal the transmission cover plate to the floor. Available at NAPA and other Automotive stores.

After a strong storm last night and 2 hours worth of intermediate to hard rain, the Jeep is bone dry in the floorboard this morning. It appears the intake grill screws were the source of the leak! I can drive in any weather now!

After a strong storm last night and 2 hours worth of intermediate to hard rain, the Jeep is bone dry in the floorboard this morning. It appears the intake grill screws were the source of the leak! I can drive in any weather now!

Love it when a plan comes together.

I started to reply after i read the first post. Then i deleted b/c bserk and john s stated my ideas.